Name the device used for measuring the e.m.f. of a cell.

The device used for grinding an ore.

Oral work : Name a device used for measuring time in olden times .

Name the device used for the measurement of internal resistance of a cell.

Answer the following question on one sentence : Name the device used to determine the density of a liquid.

Answer the following question on one sentence : Name the device used to determine the purity of a sample of milk.

A device used for measuring the rate of flow of liquid through pipes is called………..

Describe how a potentiometer is used to compare the e.m.f.s of two cells by connecting them separately.

Describe how potentiometer is used to compare the e.m.f.s of two cells by combination method.

The best instrument for the measurement of e.m.f. of a cell is..... .

Why there is no way to separate the internal resistance from the e.m.f. of a cell?